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what can be the problem that made the categories not showing on the board front, but exist on the database table?

i export an install from localhost to a web server online and everything is working except the presentation of the categories on sidebar neither in Admin section.

recalc categories does not solve. where do i seek the root of this problem?

change theme do nothing, neither any items on table database appear in html
Then you need to dig into the code. How familiar are you with writing/debugging PHP?
You should show the output of "show tables" from your database.
almost null. which was the solution. its a pun. i will answer to say what it was.thanks

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sorry the late reply to this.

the problem was that when i made the export, the cell table of the main category id should be null and there was not. somehow was filled with a zero. that leads to neither that appears on index front end, nor the sub-categories of that, because there are not any category with id zero.

at that time i don't notice that. only after a second look.

thanks to those that try to help on this.